Enclosed drive with winding device in particular for sewing machines



A ril 19, 1955 P. o. RUTISHAUSER 2,706,453

ENCLOSED DRIVE WITH WINDING DEVICE IN PARTICULAR FOR SEWING MACHINES 2 Sheets-Sheet 1 Filed May 29, 1952 April 1955 P. o. RUTISHAUSER 2,706,458

ENCLOSED DRIVE WITH WINDING DEVICE IN PARTICULAR FOR SEWING MACHINES Filed May 29, 1952 2 Sheets-Sheet 2 United States Patent ENCLOSED DRIVE WITH WINDING DEVICE IN PARTICULAR FOR SEWING MACHINES Paul 0. Rutishauser, St. Gallen, Switzerland, assignor to Regina Sewing Machine Corporation, New York, N. Y., a corporation of New York Application May 29, 1952, Serial No. 290,643 Claims priority, application Switzerland February 26, 1952 4 Claims. (Cl. 112-218) The invention relates to enclosed drive with winding device, in particular for sewing machines."

The drive is conventionally transmitted from the motor to the main shaft by a belt, the motor being installed in the housing or base of the sewing machine. It has also been proposed that the motor be tiltably mounted in the housing, so that the motor drive wheel touches a wheel on the main shaft so as to effect a friction transmission.

The enclosed drive with winding device, in particular for sewing machines, pursuant to the invention, is characterized in that the drive wheel of the tiltably mounted motor is in friction engagement with a concentric lateral groove in the handwheel rotatably mounted on the main shaft, in such a manner that the particles abraded by friction will not fall on the main shaft and motor shaft; and in that the handwheel, on the prolongation of the main shaft, bears a knurled nut with internal thread into which the winding device actuated by the handwheel can be screwed in such a manner that either the winding device is retracted and the rotation of the handwheel is transmitted to the main shaft, or the winding device is extended and the main shaft is not affected by rotation of the handwheel and winding device.

The accompanying drawing shows an example of embodiment of a sewing machine drive with winding device, as follows:

Figure 1 is a longitudinal section of the handwheel with drive and retracted winding device.

Figure 2 is a front view of the handwheel.

Fig. 3 is a longitudinal section of a portion of the bobbin winder assembly showing the winding device in extended position and the main shaft disconnected from the handwheel.

Fig. 4 is a side view of a sewing machine embodying my invention.

Herein 1 designates the sewing machine housing in which the main shaft 2 of the feed drive is mounted. The shaft 2 bears a rotatably mounted handwheel 3', which is kept from slipping off by screws 4 and ring or plate 5. The heads of screws 4 do not prevent relative rotation of the handwheel 3 and nut 7 as the said heads can rotate in the 360 concentric groove in part 7, without carrying part 7 along, as may be seen in Fig. 3 of the additional view. The handwheel, on the side towards the housing, has a concentric groove 6 with a roughened surface. On the same centerline the handwheel 3 is rotatably associated with a knurled nut 7 having an internal thread 8, which may be trapezoidal or it may constitute a strong thread having a large pitch so that the spool arm 10--14 hereinafter described can be unscrewed by merely a slight turn of part 7. Retracted within the handwheel 3 and engaging the thread 8, we have the winding device, consisting of guide pin 9, body 10 with cotter 11, external thread 12, crown gearing 13 and winding pin 14, assembled. The two ends of the cotter 11 each engage a longitudinal groove 15 in the handwheel 3. The end of the main shaft 2 projecting into the handwheel 3 likewise has crown gear 16 corresponding to that of the winding device. The drive is supplied by the motor 17 tiltably mounted at 18 in the housing 1, and with roughsurfaced drivewheel 19 engaging the groove 6.

This enclosed drive with winding device, in particular for sewing machines, functions as follows: By means of ice a lever, not shown, the motor 17 can be tilted on the pivot 18 until its own weight, with or without addition of spring pressure, engages its wheel 19 with the surface of the groove 6 and causes it to drive the rotation of the handwheel by friction. When part 7 is manually rotated counterclockwise this causes winding body or spool arm 10-14 to retract to the position shown in Fig. l, and the crown gearing of the winder body 10 is held in engagement with the crown gearing 16 of the main shaft 2. This clutch engagement, through screws 4 and ring 5, fixedly connects the handwheel 3 with the shaft 2. By suitable rotation of the knurled nut 7 clockwise, the winding pin body 10-14 is extended as shown in Fig. 3, thereby disengaging its crown gear connection with shaft 2, and handwheel 3 will rotate freely on shaft 2. The winding pin body 1014 is forced to rotate as well, by the groove in the handwheel engaging the cotter 11, and can accordingly be employed for winding.

In order to obtain a further speed reduction in addition to that afforded by variation of the motor speed by means of a rheostat, the motor drivewheel 19 may be applied to the inner wall of the groove 6 instead of to the outer wall. However, this requires reversal of the direction of rotation of the drive motor.

The arrangement as illustrated in the drawing prevents particles abraded by friction between the drivewheel 19 and the wall of the groove 6 from penetrating the bearings of the main shaft or motor shaft. Moreover, the drive is enclosed by the handwheel, which latter may be provided with a smooth external shape, thus affording extensive protection against accident.

I reserve the right to make such changes or modifications as may come within the scope of the appended claims.

I claim:

1. An enclosed drive and winding device for sewing machines having a housing and a main driven shaft positioned inwardly and also extending outwardly thereof, and having a central bore and crown gearing on its outer end, comprising in combination, a motor tiltably mounted in said housing having a drive wheel on the outer end of its shaft extending outwardly of the housing, a handwheel having a concentric lateral groove in its inner face engageable by the periphery of the motor drive wheel and a centrally bored portion having a longitudinal groove, said handwheel being detachably connected to the said shaft on its outer end and also carrying a nut on the outside of the said wheel operatively connected with a bobbin winding pin having an enlarged threaded portion engageable with mating threads in the central portion of the nut and an enlarged unthreaded portion having a cotter pin extending oppositely therefrom, said pin engageable with the longitudinal groove in the handwheel, crown gearing provided on the inner end of said portion engageable with the crown gearing on the shaft, whereby turning the nut in one direction causes the bobbin winding pin to extend so that its outer end is outside the nut, and the main driven shaft is disconnected from the handwheel.

2. An enclosed drive and winding device for sewing machines having a housing and a main driven shaft extending inwardly and outwardly of the housing comprising, in combination, a motor tiltably mounted in said housing and having a drive wheel on the outer end of its shaft extending outwardly of the housing including a central bore and crown gearing on the end, a handwheel having a concentric lateral groove in its inner face engaged by the periphery of the motor drive wheel, said handwheel being detachably connected to the outer end of said shaft and also carrying a nut on the outside of the said wheel having an enlarged internal thread ope'ratively connected with a bobbin winding assembly comprising a winding pin having an enlarged threaded portion mating the threads of the nut, an unthreaded cylindrical body portion including a cotter pin extending oppositely therefrom and engaging the groove in the handwheel, crown gearing on the end of said body portion, and a guide pin extending horizontally therefrom, all assembled, whereby upon turning the said nut in one direction, the winding pin is extended outwardly of the said nut and the crown gearing on the main shaft and on the end of said body portion is disconnected.

3. An enclosed drive and winding device for sewing machines having a housing and a main driven shaft positioned inwardly and also extending outwardly thereof, the shaft having a central bore in its outer end, comprising, in combination, a motor tiltably mounted in said housing and having a drive wheel on the outer end of its shaft extending outwardly of the housing, a handwheel having a concentric lateral groove in its inner face engageable by the periphery of the motor drive wheel and a centrally bored portion having a longitudinal groove, said handwheel being detachably connected to the main shaft on its outer end and also carrying a nut on the outside of the said wheel operatively connected with a bobbin winding pin having an enlarged threaded portion engageable with mating threads in the central portion of the nut and an enlarged unthreaded portion having a cotter pin extending oppositely from said enlarged portion and engageable with the longitudinal groove in the handwheel, means on the inner end of said enlarged portion and on the outer end of said shaft whereby turning the nut when the bobbin winding pin is in extended position to retract the said pin will cause the said shaft to be engaged by said unthreaded enlarged portion and thereby be driven by the handwheel when the motor is energized.

4. In a sewing machine having a housing and a main driven shaft positioned inwardly and also extending outwardly of the housing, the shaft having a central bore in its outer end, comprising, in combination, a motor tiltably mounted in said housing and having a drive wheel on the outer end of its shaft extending outwardly of the housing, a handwheel having a concentric lateral groove in its inner face engageable by the periphery of the motor drive wheel and a centrally bored portion having a longitudinal groove, said handwheel being detachably connected to the main shaft on its outer end and also carrying a nut on the outside of the said wheel, having an internal thread, said nut operatively connected with a bobbin winding assembly comprising a winding pin, an enlarged threaded and unthreaded portion, a cotter pin, all assembled, means on the end of the driven shaft and on the unthreaded enlarged portion of the said assembly whereby upon turning the said nut in one direction the winding pin is retracted and rotation of the handwheel by the motor drive shaft is transmitted to the main shaft, and turning the nut in the other direction will cause the winding pin to be extended and the drive shaft is disconnected from the handwheel.

, References Cited in the file of this patent UNITED STATES PATENTS 111,447 Garrick June 31, 1871 274,056 Tibbles Mar. 13, 1883 1,940,435 Oruis Dec. 19, 1933 2,144,801 Hohmann Jan. 24, 1939 2,247,381 Hohmann et a1. July 1, 1941 FOREIGN PATENTS 273,922 Switzerland Mar. 15, 1951 433,923 Italy Apr. 15, 1948 

